Architectural Concrete, Premium Residential
Project overview
A boutique residential project specified three custom architectural shades for exposed concrete walls and soffits — warm grey, charcoal, and a custom pigmented sandstone tone. Alpha Decor mix was developed against approved mockups; batch color matching held within ΔE < 1.5 across 1,800 m³ over six months.
Premium plot in Indiranagar; architect-led delivery; finish acceptance based on visual mockup panels.
The challenge
Color and finish consistency across long timelines and multiple aggregate batches.
- ›Three custom shades, all client-approved
- ›Aggregate batch variation across 6 months
- ›Architectural defect tolerance near zero
- ›Self-consolidating finish under exposed condition
The solution
Mockup-validated mix with locked aggregate source and pigment dosing per batch.
- ›Single aggregate quarry locked for the project
- ›Iron oxide pigment dosed by mass with ±1% tolerance
- ›Form-release agent matched to pigment chemistry
- ›Pre-pour color check on 1m × 1m sample panel per shift
Execution detail
6 months, 240 batches, ΔE < 1.5 across all panels.
- ›240 batches, ΔE measured weekly
- ›Reject rate: 1.2% (3 trips returned)
- ›Surface defect (bug-hole) score: ACI Surface Class 1.0
The result
Architect signed off on all panels; zero rework on exposed surfaces.
"They treated colour like a structural property. That's rare."
— Principal Architect (anonymized)
Technical specifications
| Grade | Cement (kg/m³) | SCM | w/c | Slump |
|---|---|---|---|---|
| M40 | 380 | Iron oxide 3.5% | 0.4 | 650 flow |
QC: Per-shift colour panel, weekly ΔE measurement
Products used
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